反应详情

Trityl chloride (9.43 g) is added in one portion to a solution of 2-hydroxymethyl-5-methoxy-4-pyridone (5 g) and 4-dimethylaminopyridine (4.2 g) in dry dimethylformamide (80 mL) and the solution stirred at room temperature for 12 hours. The mixture is then heated on a steam bath for 3 hours and diluted with iced water (300 mL) to give a light brown solid. The solid is collected, washed with water and sucked dry. The solid is dissolved in hot ethyl acetate to give a clear solution which immediately deposits a granular off-white solid. The solid does not redissolve on further heating. After cooling the solid is collected, washed with ethyl acetate and diethyl ether and dried to give 5-methoxy-2-trityloxymethyl-4-pyridone (7.5 g) as an off-white solid, m.p. 185-7° C.

1. temperatureThe mixture is then heated on a steam bath for 3 hours
2. customto give a light brown solid
3. customThe solid is collected
4. washwashed with water
5. customsucked dry
6. dissolutionThe solid is dissolved in hot ethyl acetate
7. customto give a clear solution which
8. dissolutionThe solid does not redissolve on further heating
9. temperatureAfter cooling the solid
10. customis collected
11. washwashed with ethyl acetate and diethyl ether
12. customdried